单选题

Why does performance degrade when many UPDATE， INSERT， or DELETE statements are issued on a tablethat has an associated Bitmap index（）

AThe DML operations re-create the Bitmap index blocks.

BThe Bitmap index is rebuilt automatically after a DML operation.

CThe smallest amount of a bitmap that can be locked is a bitmap segment.

DAdditional time is taken to remove NULL values from the Bitmap index after a DML operation.

略

相似试题

Why would you run the delete obsolete command？（）
多选题查看答案
Why would you execute the report obsolete command？（）
单选题查看答案
Why should you back up a duplicated tablespace after a TSPITR is complete？（）
单选题查看答案
Why would you use WebLogic Diagnostics Framework （WLDF） instead of Oracle Enterprise Manager （OEM）（）
单选题查看答案
Why can setting too low a value for the FAST_START_MTTR_TARGET parameter reduce your overall database performance？（）
单选题查看答案
When scaling Coherence from one to two cache servers， it will not show the same scalability as two to four. Why？（）
单选题查看答案
Identify three reasons that explain why assigning more than one managed serve achieve better performance than running one managed server with more resources?（）
多选题查看答案
You notice that a job in a chain has not completed on a nonconstrained RAC database. Which of these are valid reasons why that might occur？（）
单选题查看答案
A common approach to solve application performance issues is to add more hardware. Which two reasons describe why this alone does not always solve performance problems?（）
多选题查看答案

语音搜题

拍照搜题

打赏

Oracle认证